Index: binaries/data/mods/public/simulation/components/Formation.js
===================================================================
--- binaries/data/mods/public/simulation/components/Formation.js
+++ binaries/data/mods/public/simulation/components/Formation.js
@@ -933,6 +933,9 @@
 		{
 			this.members[this.members.indexOf(msg.entity)] = msg.newentity;
 			this.memberPositions[msg.newentity] = this.memberPositions[msg.entity];
+
+			if (this.formationMembersWithAura.indexOf(msg.entity) != -1)
+				this.formationMembersWithAura[this.formationMembersWithAura.indexOf(msg.entity)] = msg.newentity;
 		}
 
 		var cmpOldUnitAI = Engine.QueryInterface(msg.entity, IID_UnitAI);
@@ -941,6 +944,16 @@
 		if (cmpNewUnitAI)
 			cmpNewUnitAI.SetFormationController(this.entity);
 
+		for (let ent of this.formationMembersWithAura)
+		{
+			// Don't apply the aura to the aura caster
+			if (ent != msg.newentity)
+			{
+				let cmpAuras = Engine.QueryInterface(ent, IID_Auras);
+				cmpAuras.ApplyFormationBonus(msg.newentity);
+			}
+		}
+
 		// Because the renamed entity might have different characteristics,
 		// (e.g. packed vs. unpacked siege), we need to recompute motion parameters
 		this.ComputeMotionParameters();